How to use this right triangle calculator
Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.
Formula and method
Example
For legs 3 and 4, the hypotenuse is 5 and the area is 6.
Tips for a useful result
This version assumes the two values entered are the perpendicular legs.
What this calculator is useful for
Solve a right triangle from two side lengths and find the hypotenuse, angles, area and perimeter. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
Frequently asked questions
What does the Right Triangle Calculator calculate?
Solve a right triangle from two side lengths and find the hypotenuse, angles, area and perimeter.
How does the Right Triangle Calculator work?
c = √(a²+b²). Acute angles can be found with inverse tangent, such as A = arctan(a/b).
Is the Right Triangle Calculator free to use?
Yes. ERICH Calculators is free to use and does not require an account.